Insulating support for electric resistance heating element



Dec 11, 1928.

L. J. FULLER INSULATING SUPPORT FOR ELECTRIC RESISTANCE HEATING ELEMENT Filed April 8, 1927 IHHHYY/H HET Maw/154 INVENTOR Loans JfFu/ller ATTORNEY WITNESSES Patented Dec. 11,1928.

UNITED STATES 1,695,234 PATENT OFFICE.

LOUIS nuns return, or snoourrun, NEW JERSEY, ass'renoa '10 nuranoun'r, Room a nozmusa 00., or NEW YORK, N. Y., A conronarron or zmw Yoax.

INSULATING SUPPORT FOR ELECTRIC RESISTANCE HEATING ELEMENT.

Application fled April 8, 1927. Serial No. 182,017.

This invention relates to supports and has articular reference to an improved lnsulatmg support for an electric reslstance heat ng element especially, although not necessarily,

designed for sup orting heating elements of the type set fort and described 1n my copending application, Serial No. 182,016.

One of the principal disadvantages of and objections to resistance heatin element supports of the type now in genera use, resides in the tendency of the heating element to overheat at the points where it extends through the insulators, due to the confined condition of the element at these points which prevents it proper radiation and rapid oxidation by the excessive heat generated. It is therefore one of the objects of the present invention to so form the opening in an insulator member as to revent confinement of the heating element 0 and at the same time to induce a draft or en:- cula'tion of air which promotes a freer radiation.

As a further object the invention comprehends a support and insulator for electric 2 resistance heating elements for support ng the heating element in id form, WhlCll 1ncludes frame and insu ator members constructed in such a manner as to facilitate their economical assembly, rigid connection and co-relation.

Other objects of the invention reside in the simplicity of construction, the eneral efficiency derived therefrom, and t e economy with which the same ma be produced.

85 With the above recite and other objects 1 n view, reference is had to the following specification and accompanying drawings in which there is exhibited one example or embodiment of the invention which 1s in no way intended as a limitation upon the scope of the appended claims as it is to be clearly understood that variations and modifications which properly fall within the sco e of said claims may be resorted to when ound ex- 65 pedient.

In the drawings Figure 1 is a plan view of the support;

Fig. 2 is a sectional view therethrough taken approximately on the line 2--2 of Fig. 3 is an enlarged fragmentary cross sectional view;

Fig. 4 is a fragmentary sectional view taken approximately on the line 4-4 of Fig. 3

Fig. 5 is a erspective view of one of the insulator blociis removed from the frame.

Referring to the drawings by characters of reference, 10 designates an electric resistance heatin element or elements which are adapted 1303K: arranged in grid form, supported and insulated. The insulating support therefore as illustrated, consists of a main frame 11, which carries a plurality ofcross bars 12 of substantially channel form. The cross bars include a flat body portion or bight 13 and mar inal flanges 14. Insulator blocks 15 are employed which are constructed of any suitable insulating material and which have one face 16 of a width approximately equal to the distance between the marginal flanges 14 of the bars 12. The opposite face 17 is of less width than the face 16, and this is preferably although not necessarily accomlished by bevelin the side edges 18 of the looks. A medial oss 19 projects outwardly from the face 16 of the block and the boss together with the main body of the block is formed with an axial opening 20, which is of a slightly greater diameter than the diameter of the heating element 10 at the medial portion and which opening flares outwardly in opposite axial directions. The bars 12 have their bights or bodies 13 formed with longitudinally spaced openings 21 to receive and accommodate the bosses 19 for the purpose of preventing longitudinal movement or shifting of the insulator blocks 15. In the finished form of the insulating support the flanges 14; of the cross bars 12 are bent inwardly to en age the opposite side edges of the insulator locks for retaining said blocks within the cross bars against accidental displacement.

Under this construction and arrangement it will be observed that the insulator blocks are economically and effectually correlated or assembled with the cross bars of the frame to build up and properly provide an insulating support for supporting an electric resistance heating element in rid form, by forming the openings 20 as ilustrated and described of double flared configuration. The points where the heating element extends through the insulator members are prevented from overheating to such an excessive degree as to cause an unduly rapid oxidation and consequent deterioration of the element at these points. Furthermore, the particular shape of the openin s induces a draft or circulation of air whic assists materially in increasing the radiation or dissipation of the frame. elements including marginal flanges,

insulator members arranged in the frame members and each havin a boss on its inner face fitting through the Frame apertures, the said insulator members each havlng an outer face of a reduced width presenting inwardly diverging side edges against which the flanges are bent inwardly to embrace and retain the insulator members in place. Y

2. In an insulating support for electric heating elements, channel shaped apertured frame elements includin marginalflanges,insulator members arranged in the frame members and each having a boss on its inner face fitting through the frame apertures, the said insulator members each having an outer face of a reduced width presentin outwardly bev- 85 eled side edges against w ich the marginal flangesof the frame elements are bent to eilnbracmgly r ain the insulator members in p ace.

3. In an insulating support for electric re sistance heating elements, apertured frame bars of substantially dove-tailed shape in cross section, insulator blocks of similar cross sectional shape'arranged within the frame bars, and bosses formed on the insulator blocks and pro'ecting through the apertures of the frame ars to prevent lon tudinal movement of the insulator blocks wit respect to the frame bars.

4. In an insulating support for electric resistance heating elements, apertured frame bars of substantially dove-tailed shape in cross section, insulator blocks of similar cross sectional shape arranged-within the frame bars, and bosses formed onthe insulator blocks and projectin through the apertures of the frame bars, t e said insulator blocks and their bosses each having a double outwardly flared opening axially thereof through which theheating element extends.

LOUIS JAMES FULLER. 

